柚子快报邀请码778899分享:mongoose为字段添加索引

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MongoDB在读取数据时,如果没有索引,会扫描集合中的每个文件并选取那些符合查询条件的记录。

添加合适的索引能够极大的提高查询的效率

let fileStatus = new Schema({

materials: String,

geometries: String,

guid: {

type: String,

index: true,

},

size: Number,

path: String,

});

添加后启动node服务可能会出现如下提醒

(node:9764) DeprecationWarning: collection.ensureIndex is deprecated. Use createIndexes instead.

解决的方法:

在连接前添加

mongoose.set("useCreateIndex", true);

mongoose.connect(link, {

useNewUrlParser: true,

useUnifiedTopology: true,

poolSize: 1000,

});

查看索引

> db.getCollection("status").getIndexes()

[

{

"v" : 2,

"key" : {

"_id" : 1

},

"name" : "_id_",

"ns" : "abc.status"

},

{

"v" : 2,

"key" : {

"guid" : 1

},

"name" : "guid_1",

"ns" : "abc.status",

"background" : true

}

]

 

柚子快报邀请码778899分享:mongoose为字段添加索引

http://www.51969.com/

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